The dispute follows problems over the disruption of services because of a driver shortage.

Mr Herschel said drivers who are members of ASLEF had been offered significant rises by the management in a bid to solve the crisis.

Members of the RMT, who include conductors, clerical, supervisory and platform staff, want a similar deal. The conductors are now asked to vote on strike action and a ballot of other grades is expected to follow.

"We are simply looking for fair and equitable treatment," said Mr Herschel.

A spokeswoman for Arriva Trains Northern, said: "Our policy is not to comment on negotiations between employees and the company."